CVE-2021-39854 : Exploit Details and Defense Strategies
Learn about CVE-2021-39854, a vulnerability in Adobe Acrobat Reader DC that could result in application denial-of-service. Find out the impact, affected versions, and mitigation steps.
Adobe Acrobat Reader DC versions are affected by a Null pointer dereference vulnerability, potentially leading to application denial-of-service.
Understanding CVE-2021-39854
This CVE involves a vulnerability in Adobe Acrobat Reader DC that could allow an attacker to cause a denial-of-service condition.
What is CVE-2021-39854?
The vulnerability is a NULL Pointer Dereference (CWE-476) in Acrobat Reader DC versions, allowing an unauthenticated attacker to exploit it for application denial-of-service.
The Impact of CVE-2021-39854
The vulnerability has a CVSS base score of 5.5, with a medium severity rating. Key impacts include:
- Attack Complexity: Low
- Attack Vector: Local
- Availability Impact: High
- User Interaction: Required
Technical Details of CVE-2021-39854
This section provides more in-depth technical details related to the vulnerability.
Vulnerability Description
Adobe Acrobat Reader DC versions 2021.005.20060, 2020.004.30006, and 2017.011.30199 (and earlier) are impacted by a Null pointer dereference vulnerability.
Affected Systems and Versions
- Affected Product: Acrobat Reader
- Vendor: Adobe
- Vulnerable Versions:
- Acrobat Reader DC 2021 July
- Acrobat Reader 20.0-Classic 2021 July
- Acrobat Reader 17.0-Classic 2021 July
Exploitation Mechanism
To exploit this vulnerability, an attacker would need to trick a victim into opening a malicious file, which then triggers the Null pointer dereference flaw.
Mitigation and Prevention
Understanding how to mitigate and prevent this vulnerability is crucial for maintaining system security.
Immediate Steps to Take
- Update to the latest version of Acrobat Reader DC to patch the vulnerability.
- Exercise caution when opening files from untrusted sources.
Long-Term Security Practices
- Regularly update software and operating systems to avoid known vulnerabilities.
- Educate users on identifying and avoiding potential phishing attempts.
Patching and Updates
Ensure ongoing monitoring and patching of software and systems to address any future vulnerabilities that may arise.